body{
    position:relative;
    height:100%;
    width:100%;
    background-size:cover;
    background-repeat: no-repeat;
    margin: 0;
}

#logo{
    width:96px;
    height:96px;
    position:absolute;
    top:20%;
    left:50%;
    margin:-48px 0 0 -48px;
}
#tip{
    width: 80%;
    position: absolute;
    color: white;
    font-size: 19px;
    top: 33%;
    left: 10%;
}

#roomName{
    background-color: transparent;
    width: 80%;
    position: absolute;
    color: white;
    font-size: 30px;
    top: 44%;
    left: 10%;
    border-color: white;
    border-style: solid;
    border-top-width: 0px;
    border-right-width: 0px;
    border-bottom-width: 1px;
    border-left-width: 0px;
}
#startTalk{
    font-size: medium;
    width: 80%;
    position: absolute;
    color: white;
    top: 60%;
    left: 10%;
    height: 7%;
    background-color: rgba(25, 250, 75, 0.68);
    border-style: solid;
    border-top-width: 0px;
    border-right-width: 0px;
    border-bottom-width: 0px;
    border-left-width: 0px;
}